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首页> 外文会议>Conference on Photon Processing in Microelectronics and Photonics III; 20040126-20040129; San Jose,CA; US >Self-assembly of highly rigid ferrocenyl nanostructures monitored by optical second harmonic generation
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Self-assembly of highly rigid ferrocenyl nanostructures monitored by optical second harmonic generation

机译：通过光学二次谐波监测高刚性二茂铁基纳米结构的自组装

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摘要

Most compounds used for thin film formation with nanometer dimensions in the past are intrinsically "soft" due to flexible spacer units, which limit the overall film ordering. In order to resolve this problem we have synthesised compounds bearing very rigid π-spacers to connect the 2,2':6',2"-terpyridin-4'-yl head groups and redox-active ferrocenyl functional groups. Subsequently, we have prepared highly ordered nanostructured surfaces by self-assembly of these rigid ferrocenyl functionalised terpyridines. Adsorption and assembly from solution on different substrates were studied in situ by optical second harmonic generation (SHG). With this technique a signal can be generated exclusively at the interface which makes readily possible investigations of adsorption and film assembly in the submonolayer regime. The experimental data clearly show formation of monomolecular films on the substrate on a timescale of typically several minutes. This process can be described by diffusion-limited Langmuir kinetics. Most importantly, we have also found that film growth is followed by self-assembly of highly ordered ferrocenyl nanostructures on a much longer timescale. This opens the door to exploit these rigid, oriented molecules as templates for the preparation of novel structures consisting, for example, of metal nanoparticle arrays or multilayer architectures.
机译：由于柔性间隔单元，过去用于纳米级薄膜形成的大多数化合物本质上是“软”的，这限制了整个膜的有序性。为了解决这个问题，我们合成了带有非常刚性的π间隔基的化合物，该化合物连接了2,2'：6'，2“-萜吡啶-4'-基的头基和氧化还原活性的二茂铁基官能团。通过这些刚性二茂铁基官能化的三联吡啶的自组装制备出高度有序的纳米结构表面，并通过光学二次谐波（SHG）在原位研究了溶液在不同基质上的吸附和组装，通过这种技术，信号只能在界面处产生。我们可以很容易地研究亚单层状态下的吸附和膜组装，实验数据清楚地表明，通常在几分钟内，在基板上就会形成单分子膜，这一过程可以用扩散受限的朗缪尔动力学来描述。我们还发现，在薄膜生长之后，会在更长的时间范围内自组装高度有序的二茂铁基纳米结构。为利用这些刚性的，定向的分子作为模板制备新型结构（例如由金属纳米颗粒阵列或多层结构组成）打开了大门。

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